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python螺旋万花筒

代码如下：

import turtle
from itertools import cycle

colors = cycle(['red', 'orange', 'yellow', 'green', 'blue', 'purple'])

def draw_circle(size,angle,shift):
    turtle.pencolor(next(colors))
    turtle.circle(size)
    turtle.right(angle)
    turtle.forward(shift)
    draw_circle(size + 5, angle + 1, shift + 1)

turtle.bgcolor('black')
turtle.speed('fast')
turtle.pensize(4)
draw_circle(25, 5, 10)

turtle.pencolor('red')
turtle.circle(30)

效果图：